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Here's the problem: The drawing (Click Here) shows a block (m = 1.6 kg) and a spring (k = 325 N/m) on a frictionless incline. The spring is compressed by x_o = 0.35 m relative to it's unstrained position at x = 0 m and then released. What is the speed of the block when the spring is still compressed by x_f = 0.14 m?

I applied the whole Ef = Eo equation but did not get the right answer.

I used sin 30 to find h_f.

So this is what I used:

V_i = 0

V_f = what I'm looking for

h_i = 0

h_f = .5

k = 325

x_i = 0.35

x_f = 0.14

Any help on this problem would be greatly appreciated.

Thanks in advance.